The application of curve fitting to the preferences setting for the university entrance examination

College entrance examination is a hot spot of the whole society. Filling the college enterance exam form is a very important link. so it is called “the second examination”. For the examinees, the form-filling is an essential decision-making, which directly determines whether they can enter their ideal colleges. In order to help the examinees to fill the form and enter the ideal colleges, we need to low the risk of form-filling to the minimum. I his paper use the least square method, combine the past passing scores of every province and every college(includes highest, average, lowest passing scores), fit three approximate curves. simulate the trend of the passing score in every province and Anally help the examinees fill the form.